It's called 3wave because your goal in this is to turn every number to threes. And you do that by tapping them. The number you tap increases by two, and those around it increase by one. Three is highest but numbers loop (three hit by wave turns to zero and tapped three turns to one). Pretty simple mechanics, but later levels are quite challenging.
TL;DR If you like puzzle games then give this one a try. Who knows, you might like it.